RCS – Registered Cardiac Sonographer (CCI) — Questions and Answers

Question 1: During exercise ABI testing, a patient's ABI drops from 0.85 at rest to 0.52 immediately after treadmill walking. What does this indicate?

Hemodynamically significant arterial stenosis (Correct answer)
Normal physiologic response
Venous insufficiency
Vasospasm only

Correct answer: Hemodynamically significant arterial stenosis

A post-exercise ABI drop of ≥20% or to below 0.90 confirms hemodynamically significant PAD not apparent at rest.

Question 2: During evaluation of a femoral artery pseudoaneurysm post-catheterization, duplex imaging reveals a to-and-fro flow pattern in the neck connecting the pseudoaneurysm sac to the native artery. What does this pattern represent?

Arteriovenous fistula communication
Bidirectional flow characteristic of a pseudoaneurysm neck (Correct answer)
Turbulence from vessel stenosis
Normal post-procedure arterial flow

Correct answer: Bidirectional flow characteristic of a pseudoaneurysm neck

The classic to-and-fro pattern in the pseudoaneurysm neck reflects inflow during systole and outflow during diastole between the sac and native artery.

Question 3: The Doppler shift frequency is directly proportional to which of the following?

The velocity of the moving reflector (blood cells) (Correct answer)
The wall filter cutoff
The pulse repetition frequency only
The depth of the sample volume

Correct answer: The velocity of the moving reflector (blood cells)

The Doppler equation shows that Doppler shift = (2 × f × v × cos θ) / c; shift is directly proportional to velocity of the reflector.

Question 4: In a patient undergoing exercise stress echocardiography for asymptomatic mitral stenosis, which finding at peak exercise warrants intervention?

Failure of heart rate to increase by 10 bpm
Exercise-induced mean mitral gradient >15 mmHg or pulmonary artery systolic pressure >60 mmHg (Correct answer)
Peak transmitral velocity >2 m/s at rest only
No change in mitral valve area with exercise

Correct answer: Exercise-induced mean mitral gradient >15 mmHg or pulmonary artery systolic pressure >60 mmHg

Exercise-induced mean gradient >15 mmHg or PASP >60 mmHg identifies hemodynamically significant MS even in asymptomatic patients, supporting earlier intervention per ACC/AHA guidelines.

Question 5: A 55-year-old male patient presents with bilateral buttock and thigh claudication and erectile dysfunction. Physical examination reveals absent femoral pulses. These findings are most suggestive of occlusive disease in which arterial segment?

Superficial femoral arteries
Tibioperoneal trunk
Aortoiliac segment (Correct answer)
Popliteal arteries

Correct answer: Aortoiliac segment

The combination of bilateral buttock/thigh claudication, absent femoral pulses, and erectile dysfunction is the classic triad for Leriche syndrome, which is caused by severe stenosis or occlusion of the aortoiliac segment. The location of claudication symptoms typically points to occlusive disease at or proximal to that level.

Question 6: In tricuspid regurgitation severity assessment, a vena contracta width of >7 mm indicates:

Mild tricuspid regurgitation
Moderate tricuspid regurgitation
Trace tricuspid regurgitation
Severe tricuspid regurgitation (Correct answer)

Correct answer: Severe tricuspid regurgitation

A vena contracta width greater than 7 mm is a specific marker of severe tricuspid regurgitation by ASE 2017 guideline criteria.

Question 7: Holodiastolic flow reversal in the descending thoracic aorta by pulsed Doppler is most consistent with which severity of aortic regurgitation?

Moderate aortic regurgitation
Severe aortic regurgitation (Correct answer)
Mild aortic regurgitation
Pulmonary regurgitation

Correct answer: Severe aortic regurgitation

Holodiastolic reversal throughout the descending thoracic aorta (EDV/PSV ratio >0.2) reflects a large regurgitant volume returning to the LV throughout diastole, a hallmark of severe AR.

Question 8: Which echocardiographic finding is characteristic of cardiac tamponade?

Mitral valve prolapse with regurgitation
Right ventricular diastolic collapse and respiratory variation in mitral inflow >25% (Correct answer)
Left ventricular hypertrophy
Enlarged left atrium only

Correct answer: Right ventricular diastolic collapse and respiratory variation in mitral inflow >25%

Cardiac tamponade produces RV diastolic collapse, RA systolic collapse, and >25% respiratory variation in mitral inflow velocity due to elevated pericardial pressure.

Question 9: Pacemaker syndrome is best described as symptoms caused by which of the following?

Lead insulation failure
Electromagnetic interference
AV dyssynchrony during ventricular pacing (Correct answer)
Battery end-of-life

Correct answer: AV dyssynchrony during ventricular pacing

Pacemaker syndrome occurs when ventricular-only pacing (e.g., VVI) causes loss of AV synchrony, leading to retrograde VA conduction and symptoms such as fatigue, dizziness, and hypotension.

Question 10: In the context of transesophageal echocardiography (TEE), the higher image quality compared to transthoracic echo is mainly due to:

Use of continuous wave Doppler exclusively
Use of lower frequency transducers
Higher gain settings available
Elimination of chest wall and lung attenuation by placing the probe adjacent to the heart (Correct answer)

Correct answer: Elimination of chest wall and lung attenuation by placing the probe adjacent to the heart

The esophagus lies directly posterior to the heart, eliminating lung and chest wall attenuation and allowing higher frequency transducers that provide superior resolution.

Question 11: During a lower extremity venous duplex exam, reflux in the great saphenous vein is defined as retrograde flow lasting longer than:

3.0 seconds
2.0 seconds
0.5 seconds (Correct answer)
1.0 second

Correct answer: 0.5 seconds

Reflux in superficial veins (GSV, SSV) is defined as retrograde flow duration exceeding 0.5 seconds after augmentation release.

Question 12: Which echocardiographic parameter best reflects the hemodynamic significance of mitral regurgitation?

Pulmonary vein systolic flow reversal alone
Effective regurgitant orifice area (EROA) (Correct answer)
Color Doppler jet area
Peak regurgitant velocity

Correct answer: Effective regurgitant orifice area (EROA)

EROA quantifies the size of the regurgitant orifice independent of driving pressure, making it the most accurate single parameter for MR severity grading.

Question 13: Which color flow Doppler finding in the hepatic veins indicates severe tricuspid regurgitation?

Diastolic dominance in hepatic veins
Increased E-wave velocity in hepatic veins
Blunted systolic hepatic vein flow
Systolic flow reversal in the hepatic veins (Correct answer)

Correct answer: Systolic flow reversal in the hepatic veins

Systolic reversal of hepatic venous flow is a specific indicator of severe tricuspid regurgitation, reflecting retrograde transmission of high right atrial pressure into the venous system.

Question 14: During carotid duplex, the sample volume should be placed at what angle to the vessel wall to obtain an accurate Doppler velocity measurement?

60 degrees or less (Correct answer)
0 degrees
90 degrees
75 degrees

Correct answer: 60 degrees or less

A Doppler angle ≤60° is required for accurate velocity measurements; angles >60° cause significant overestimation of velocities.

Question 15: In echocardiography, the term 'frame rate' refers to:

The number of 2D images acquired per second (Correct answer)
The number of Doppler samples per cardiac cycle
The speed of sound in tissue
The pulse repetition frequency of M-mode

Correct answer: The number of 2D images acquired per second

Frame rate is the number of complete 2D image frames acquired per second and determines the temporal resolution of real-time imaging.

Question 16: What is the primary reason collateral vessels have higher resistance than the native artery they replace?

Collaterals are smaller in diameter and longer in length (Correct answer)
Collaterals are composed of veins
Collaterals lack smooth muscle
Collaterals have thicker walls reducing lumen size

Correct answer: Collaterals are smaller in diameter and longer in length

Poiseuille's law dictates that resistance is proportional to length and inversely proportional to radius to the fourth power, making small, long collaterals high-resistance.

Question 17: Which transducer type is most commonly used for adult transthoracic echocardiography?

Phased array (Correct answer)
Linear array
Curvilinear array
Mechanical sector

Correct answer: Phased array

Phased array transducers use electronic steering to create a small footprint with a wide sector image, making them ideal for imaging through narrow intercostal spaces.

Question 18: In the NBG pacemaker coding system, what does the first letter represent?

Chamber paced (Correct answer)
Rate modulation
Chamber sensed
Response to sensing

Correct answer: Chamber paced

The first position of the NBG code identifies the chamber(s) being paced: O (none), A (atrium), V (ventricle), or D (dual).

Question 19: The lateral resolution of an ultrasound beam is primarily determined by:

Pulse duration
Depth of the target
Beam width at a given depth (Correct answer)
Frequency alone

Correct answer: Beam width at a given depth

Lateral resolution equals the beam width at the depth of the target; objects closer together than the beam width cannot be resolved as separate structures.

Question 20: Which echocardiographic feature differentiates rheumatic aortic regurgitation from aortic root dilation-related AR?

Shorter pressure half-time in rheumatic AR
Leaflet thickening and restricted motion at the tips versus normal leaflet morphology with diastolic coaptation failure (Correct answer)
Central regurgitant jet versus eccentric jet
Holodiastolic flow reversal in the descending aorta in rheumatic versus absence in root dilation

Correct answer: Leaflet thickening and restricted motion at the tips versus normal leaflet morphology with diastolic coaptation failure

Rheumatic AR shows thickened, retracted leaflets with restricted motion causing coaptation failure at the tips, while aortic root dilation causes AR by stretching apart otherwise normal leaflets.

Question 21: In atrial flutter, what is the typical atrial rate (flutter wave rate)?

100–150 bpm
150–200 bpm
250–350 bpm (Correct answer)
350–450 bpm

Correct answer: 250–350 bpm

Typical (type I) atrial flutter has an atrial rate of 250–350 bpm producing characteristic sawtooth flutter waves, most visible in inferior leads.

Question 22: The continuity equation is used primarily to calculate which valve area?

Pulmonic valve area
Mitral valve area
Tricuspid valve area
Aortic valve area (Correct answer)

Correct answer: Aortic valve area

The continuity equation (AVA = LVOT area × LVOT VTI / AV VTI) is the standard method for calculating aortic valve area by echocardiography.

Question 23: In color flow Doppler, the variance map (green) indicates:

High velocity laminar flow
Retrograde flow only
Turbulent or disturbed flow (Correct answer)
Absence of flow

Correct answer: Turbulent or disturbed flow

Green color or color variance in the color flow map indicates turbulent or disturbed flow with multiple velocities present within the sample volume.

Question 24: The right coronary artery originates from the ________________?

LCX
Right circumflex
LAD
Right coronary aortic sinus (Correct answer)

Correct answer: Right coronary aortic sinus

Explanation: The right coronary artery (RCA) originates from the right coronary aortic sinus, which is one of the three sinuses of Valsalva located at the root of the ascending aorta. The RCA supplies blood to the right atrium, right ventricle, and portions of the conducting system of the heart.

Question 25: In pulsed wave Doppler, the Nyquist limit determines the maximum:

Depth that can be sampled
Pulse duration used
Velocity that can be accurately measured without aliasing (Correct answer)
Frame rate achievable

Correct answer: Velocity that can be accurately measured without aliasing

The Nyquist limit is half the pulse repetition frequency; velocities causing Doppler shifts exceeding this value will alias and display incorrectly.

Question 26: In assessing pulmonic stenosis severity, a peak instantaneous Doppler gradient of 65 mmHg indicates:

Trivial pulmonic stenosis
Moderate pulmonic stenosis (36–64 mmHg)
Mild pulmonic stenosis (<36 mmHg)
Severe pulmonic stenosis (>64 mmHg) (Correct answer)

Correct answer: Severe pulmonic stenosis (>64 mmHg)

A peak gradient exceeding 64 mmHg defines severe pulmonic stenosis; these patients typically qualify for percutaneous balloon pulmonic valvuloplasty.

Question 27: On a 12-lead ECG, ST elevation in leads II, III, and aVF most likely indicates ischemia in which territory?

Inferior wall (Correct answer)
Anterior wall
Lateral wall
Posterior wall

Correct answer: Inferior wall

Leads II, III, and aVF view the inferior surface of the heart, supplied primarily by the right coronary artery.

Question 28: Which waveform characteristic indicates high distal vascular resistance in a peripheral artery?

Broad systolic peak with low pulsatility
Triphasic waveform with prominent reverse component (Correct answer)
Continuous forward flow throughout diastole
Monophasic waveform with absent reverse flow

Correct answer: Triphasic waveform with prominent reverse component

A triphasic waveform with a prominent reverse-flow component in early diastole is the hallmark of high distal resistance.

Question 29: To improve axial resolution, the sonographer should choose a transducer with:

A higher frequency and a short spatial pulse length. (Correct answer)
A lower frequency and a long spatial pulse length.
A higher frequency and a long spatial pulse length.
A lower frequency and a short spatial pulse length.

Correct answer: A higher frequency and a short spatial pulse length.

Axial resolution, the ability to distinguish two structures parallel to the beam's path, is primarily determined by the spatial pulse length (SPL). A shorter SPL results in better axial resolution. The SPL is shortened by using a higher frequency transducer and by damping the piezoelectric element to produce fewer cycles per pulse.

Question 30: Which of the following would more than likely not be documented on the official report for the echocardiography images?

Facilities identifying information
Date of the examination
Cost of the examination (Correct answer)
Name of the patient

Correct answer: Cost of the examination

Explanation: The official report for echocardiography images typically includes essential medical information such as the name of the patient (option A), facility identifying information (option B), and the date of the examination (option C). However, the cost of the examination is typically not documented on the official medical report, as it is a financial aspect that is managed separately from the medical documentation.

Question 31: The ankle-brachial index (ABI) in a normal individual should be approximately:

0.9–1.3 (Correct answer)
0.5–0.7
1.3–1.5
0.7–0.9

Correct answer: 0.9–1.3

A normal ABI ranges from 0.9 to 1.3; values below 0.9 suggest peripheral arterial disease.

Question 32: Which cardiac structure is the primary determinant of afterload for the left ventricle?

Venous return volume
Pulmonary vascular resistance
Left atrial pressure
Systemic vascular resistance (Correct answer)

Correct answer: Systemic vascular resistance

Left ventricular afterload is primarily determined by systemic vascular resistance (SVR), which the LV must overcome to eject blood into the aorta.

Question 33: Which finding on 2D echocardiography is most specific for mitral valve prolapse?

E/A ratio reversal on mitral inflow Doppler
Billowing of mitral leaflet(s) >2 mm posterior to the annular plane in the parasternal long-axis view (Correct answer)
Eccentric mitral regurgitation jet on apical 4-chamber view
Mitral leaflet thickening >5 mm in any view

Correct answer: Billowing of mitral leaflet(s) >2 mm posterior to the annular plane in the parasternal long-axis view

The diagnostic criterion for MVP is systolic displacement of one or both leaflets ≥2 mm beyond the mitral annular plane in the parasternal long-axis view, which avoids false positives from the saddle-shaped annulus.

Question 34: The 'dead zone' near-field artifact is caused by:

High gain settings
Refraction at tissue interfaces
Side lobes creating false echoes
Transducer ringing after pulse transmission that obscures shallow structures (Correct answer)

Correct answer: Transducer ringing after pulse transmission that obscures shallow structures

After each transmitted pulse, the transducer crystals continue to vibrate briefly (ring-down), masking echoes from very shallow structures during this dead zone period.

Question 35: Which rhythm is characterized by three or more consecutive PVCs?

Ventricular fibrillation
Accelerated idioventricular rhythm
Ventricular tachycardia (Correct answer)
Ventricular flutter

Correct answer: Ventricular tachycardia

Three or more consecutive PVCs at a rate >100 bpm defines ventricular tachycardia, a potentially life-threatening arrhythmia.

Question 36: Which echocardiographic finding is most consistent with constrictive pericarditis rather than restrictive cardiomyopathy?

Biatrial enlargement with normal pericardium
Septal bounce with respiratory variation in mitral inflow >25% and tissue Doppler e' >9 cm/s (Correct answer)
E/e' ratio >14 with preserved LV size
Markedly increased myocardial thickness

Correct answer: Septal bounce with respiratory variation in mitral inflow >25% and tissue Doppler e' >9 cm/s

Constrictive pericarditis shows a septal bounce, >25% respiratory variation in mitral inflow, and preserved or elevated e' (annulus paradoxus) due to the rigid pericardium enhancing ventricular coupling.

Question 37: Which condition is most commonly associated with rheumatic mitral stenosis?

Isolated annular calcification
Posterior leaflet prolapse
Commissural fusion with leaflet thickening (Correct answer)
Chordal elongation

Correct answer: Commissural fusion with leaflet thickening

Rheumatic disease causes commissural fusion, leaflet thickening, and subvalvular disease, producing the classic 'hockey stick' anterior leaflet deformity.

Question 38: A sonographer is using the continuity equation to calculate the aortic valve area. The principle underlying this equation is that, in the absence of intracardiac shunts or significant regurgitation, the:

Stroke volume through the LVOT must equal the stroke volume through the aortic valve. (Correct answer)
Pressure gradient across the LVOT and aortic valve must be equal.
Velocity of blood flow is constant from the LVOT through the aortic valve.
Kinetic energy of blood is converted entirely to potential energy after the valve.

Correct answer: Stroke volume through the LVOT must equal the stroke volume through the aortic valve.

The continuity equation is based on the principle of conservation of mass. It assumes that the volume of blood (stroke volume) that flows through a proximal, non-stenotic area (like the LVOT) must equal the volume that flows through the stenotic area (the aortic valve) in the same amount of time.

Question 39: What is the Wilkins score used to assess?

Tricuspid regurgitation etiology
Suitability of mitral valve for percutaneous balloon mitral valvuloplasty (Correct answer)
Risk of aortic valve repair failure
Severity of aortic stenosis

Correct answer: Suitability of mitral valve for percutaneous balloon mitral valvuloplasty

The Wilkins score grades mitral leaflet mobility, thickening, calcification, and subvalvular thickening (0–16); a score ≤8 predicts good outcome with percutaneous balloon mitral valvuloplasty.

Question 40: During balloon inflation in PTCA, ST-segment elevation in the monitored lead MOST likely represents:

Transient ischemia from balloon occlusion (Correct answer)
Pericarditis
Lead misplacement
Reperfusion injury only

Correct answer: Transient ischemia from balloon occlusion

Balloon inflation temporarily occludes coronary flow, causing ischemia in the supplied territory manifesting as transient ST elevation.

Question 41: What is the most common primary indication for permanent pacemaker implantation?

Atrial fibrillation with rapid ventricular response
Hypertensive urgency
Symptomatic bradycardia (Correct answer)
Ventricular tachycardia

Correct answer: Symptomatic bradycardia

Symptomatic bradycardia, including sick sinus syndrome and high-degree AV block causing symptoms, is the most common indication for permanent pacemaker implantation.

Question 42: During stress echocardiography, which new wall motion abnormality at peak stress is most indicative of significant coronary artery disease?

Isolated right ventricular dilation
Stress-induced hypokinesis or akinesis in a coronary territory (Correct answer)
Increased LVEF with exercise
Hyperkinesis in the inferolateral wall

Correct answer: Stress-induced hypokinesis or akinesis in a coronary territory

New stress-induced regional wall motion abnormality (hypokinesis or akinesis) in a coronary distribution indicates myocardial ischemia due to significant CAD.

Question 43: Which vascular access site is MOST associated with retroperitoneal hemorrhage as a complication?

Femoral artery above the inguinal ligament (Correct answer)
Brachial artery
Radial artery
Femoral artery below the inguinal ligament

Correct answer: Femoral artery above the inguinal ligament

High femoral puncture above the inguinal ligament can lacerate vessels in the retroperitoneal space, making hemorrhage difficult to detect and compress.

Question 44: The left circumflex artery typically supplies which portion of the left ventricle?

Lateral wall and posterior wall (Correct answer)
Anterior wall and apex
Interventricular septum
Inferior wall and posterior descending territory

Correct answer: Lateral wall and posterior wall

The left circumflex artery courses in the left AV groove and typically supplies the lateral and posterior walls of the left ventricle via obtuse marginal branches.

Question 45: What is the normal duration of the QRS complex in adults?

0.20–0.28 seconds
0.06–0.10 seconds (Correct answer)
0.12–0.20 seconds
0.04–0.06 seconds

Correct answer: 0.06–0.10 seconds

A normal QRS complex measures 0.06–0.10 seconds (60–100 ms); a duration ≥0.12 seconds is considered abnormally wide.

Question 46: A patient's aortic valve area calculated by the Gorlin formula is 0.6 cm². This finding is consistent with:

Normal aortic valve
Moderate aortic stenosis
Severe aortic stenosis (Correct answer)
Mild aortic stenosis

Correct answer: Severe aortic stenosis

An aortic valve area ≤0.6–1.0 cm² (with critical being <0.6 cm²) is classified as severe aortic stenosis per ACC/AHA guidelines.

Question 47: What is the most common cause of acute pacemaker failure to capture in the early post-implant period?

Insulation break
Battery depletion
Electromagnetic interference
Lead dislodgement (Correct answer)

Correct answer: Lead dislodgement

Lead dislodgement is the most common cause of failure to capture in the early post-implant period, as leads have not yet become secured by fibrosis.

Question 48: Which finding on ECG is characteristic of hyperkalemia?

Prominent U waves
Prolonged QT interval
Tall, peaked T waves (Correct answer)
Delta waves

Correct answer: Tall, peaked T waves

Hyperkalemia classically produces tall, narrow, peaked (tent-shaped) T waves, especially in precordial leads, as an early ECG manifestation.

Question 49: What is the normal range for mitral valve area (MVA) as measured by the pressure half-time (PHT) method?

4.0–6.0 cm² (Correct answer)
1.0–2.0 cm²
0.5–1.0 cm²
2.0–3.0 cm²

Correct answer: 4.0–6.0 cm²

Normal MVA is 4.0–6.0 cm²; severe mitral stenosis is defined as MVA ≤1.5 cm², with MVA = 220/PHT.

Question 50: A patient has a measured Qp:Qs ratio of 2.5:1. How should this be interpreted?

No significant shunt is present
A right-to-left shunt with pulmonary blood flow reduced by 2.5 times
Pulmonary hypertension with elevated PVR
A left-to-right shunt with pulmonary blood flow 2.5 times systemic flow (Correct answer)

Correct answer: A left-to-right shunt with pulmonary blood flow 2.5 times systemic flow

A Qp:Qs ratio of 2.5:1 indicates a significant left-to-right shunt where pulmonary blood flow is 2.5 times systemic blood flow, typically warranting intervention.

Question 51: Which waveform pattern is expected at the common femoral artery in a normal, resting adult patient?

Continuous forward flow
Monophasic low-resistance
Biphasic with no reverse flow component
Triphasic with reverse flow component (Correct answer)

Correct answer: Triphasic with reverse flow component

The normal resting common femoral artery waveform is triphasic with a reverse flow component during early diastole.

Question 52: In a patient with suspected aortic stenosis and atrial fibrillation, which adaptation to the Doppler technique improves AVA accuracy?

Applying pressure half-time instead of continuity equation
Measuring only during sinus beats if AV node is conducting
Averaging gradients and VTI over at least 5 cardiac cycles to account for beat-to-beat variability (Correct answer)
Using the highest single-beat gradient recorded

Correct answer: Averaging gradients and VTI over at least 5 cardiac cycles to account for beat-to-beat variability

In atrial fibrillation, stroke volume varies cycle to cycle; averaging Doppler measurements over a minimum of 5 beats reduces variability and improves reliability of the continuity equation AVA.

Question 53: A 'comet-tail' artifact seen posterior to a small hyperechoic focus is most likely caused by:

Refraction at a curved surface
Acoustic shadowing from calcification
Side lobes from the transducer
Reverberation between closely spaced strong reflectors creating a bright tapering trail (Correct answer)

Correct answer: Reverberation between closely spaced strong reflectors creating a bright tapering trail

Comet-tail artifacts arise from reverberation between the near and far walls of a small metallic or calcified reflector, producing a bright tapering trail of echoes distal to the focus.

Question 54: During pulse volume recording (PVR), what does a flat or nearly absent waveform at the ankle level indicate?

Improper cuff inflation
Normal perfusion with low cardiac output
Severe proximal occlusive disease (Correct answer)
Venous hypertension artifact

Correct answer: Severe proximal occlusive disease

A flat PVR waveform at the ankle indicates severe reduction in pulsatile blood flow from significant proximal occlusive disease.

Question 55: Which echocardiographic parameter BEST distinguishes constrictive pericarditis from restrictive cardiomyopathy?

Left atrial volume index
Mitral inflow E/A ratio
Respiratory variation in mitral E velocity >25% with septal bounce (Correct answer)
Pulmonary vein D-wave velocity

Correct answer: Respiratory variation in mitral E velocity >25% with septal bounce

Constrictive pericarditis demonstrates >25% respirophasic variation in mitral E velocity and interventricular septal bounce due to enhanced ventricular interdependence, unlike restrictive cardiomyopathy.

Question 56: Harmonic imaging improves image quality primarily by:

Widening the beam width
Increasing pulse repetition frequency
Increasing transmitted frequency
Reducing side lobe and reverberation artifacts (Correct answer)

Correct answer: Reducing side lobe and reverberation artifacts

Tissue harmonic imaging uses the second harmonic frequency generated within tissue, which has a narrower beam and fewer near-field artifacts than the fundamental frequency.

Question 57: A patient has a tricuspid regurgitation jet velocity of 3.5 m/s and an estimated right atrial pressure of 10 mmHg. What is the estimated RVSP?

69 mmHg
59 mmHg (Correct answer)
39 mmHg
49 mmHg

Correct answer: 59 mmHg

RVSP = 4v² + RAP = 4(3.5)² + 10 = 49 + 10 = 59 mmHg using the simplified Bernoulli equation.

Question 58: The axial resolution of an ultrasound system is best improved by:

Decreasing transducer frequency
Shortening pulse duration (using higher frequency or damped transducers) (Correct answer)
Increasing gain
Widening the sector angle

Correct answer: Shortening pulse duration (using higher frequency or damped transducers)

Axial resolution = spatial pulse length / 2; shorter pulses achieved with higher frequencies or heavy damping allow discrimination of closely spaced objects along the beam axis.

Question 59: Which finding on echocardiography is most consistent with hypertrophic obstructive cardiomyopathy (HOCM)?

Asymmetric septal hypertrophy with systolic anterior motion of the mitral valve (Correct answer)
Concentric LV hypertrophy with preserved EF and restrictive filling
Apical LV aneurysm
Dilated left ventricle with global hypokinesis

Correct answer: Asymmetric septal hypertrophy with systolic anterior motion of the mitral valve

HOCM is characterized by asymmetric septal hypertrophy (ASH) and systolic anterior motion (SAM) of the mitral valve, which causes dynamic LVOT obstruction.

Question 60: Which bioeffect mechanism is most relevant to diagnostic ultrasound safety concerns at standard clinical intensities?

Radiation pressure effects
Ionizing radiation exposure
Cavitation (both stable and inertial) (Correct answer)
Thermal damage from continuous heating

Correct answer: Cavitation (both stable and inertial)

Cavitation—oscillation and possible collapse of microbubbles in tissue—is the primary non-thermal bioeffect concern, though significant risk at diagnostic power levels is not established.

Question 61: A post-cardiac surgery patient's ECG shows alternating electrical axis with every other beat. What is this finding called?

Electrical alternans (Correct answer)
Intermittent bundle branch block
Bigeminy
Bidirectional ventricular tachycardia

Correct answer: Electrical alternans

Electrical alternans is the beat-to-beat alternation in QRS amplitude or axis, classically associated with pericardial effusion and cardiac tamponade.

Question 62: In a patient with a bioprosthetic mitral valve, which Doppler finding should raise concern for prosthetic valve stenosis?

Normal pressure half-time of 60 ms
Mean gradient >5–6 mmHg at rest (Correct answer)
Peak E-wave velocity of 1.4 m/s
Mean gradient <3 mmHg

Correct answer: Mean gradient >5–6 mmHg at rest

A mean gradient exceeding 5–6 mmHg at rest for a mitral bioprosthesis is above the expected normal range and suggests pathologic obstruction requiring further investigation.

Question 63: Which of the following is a TRUE statement about ionic versus non-ionic contrast media?

Ionic contrast has fewer osmolarity-related side effects
Non-ionic contrast is associated with lower rates of allergic-type reactions (Correct answer)
Ionic contrast is preferred in patients with renal insufficiency
Non-ionic contrast has higher osmolality than ionic contrast

Correct answer: Non-ionic contrast is associated with lower rates of allergic-type reactions

Non-ionic (low-osmolar) contrast agents carry a lower risk of anaphylactoid and hemodynamic reactions compared to high-osmolar ionic agents.

Question 64: Which Doppler equation component must the sonographer manually align to minimize velocity measurement error?

Doppler angle (θ) (Correct answer)
Wall filter setting
Sample volume depth
Pulse repetition frequency

Correct answer: Doppler angle (θ)

Velocity = (Doppler shift × c) / (2 × frequency × cos θ); the angle θ must be estimated and corrected by the operator to calculate true velocity.

Question 65: Cardiac output is calculated as:

Stroke volume ÷ heart rate
Mean arterial pressure ÷ systemic vascular resistance
Heart rate × end-diastolic volume
Heart rate × stroke volume (Correct answer)

Correct answer: Heart rate × stroke volume

Cardiac output (CO) equals heart rate (HR) multiplied by stroke volume (SV), representing the total volume of blood pumped per minute.

Question 66: A patient presents with rest pain and a non-healing ulcer on the great toe. ABI is 0.30. What Rutherford classification does this represent?

Category 3 — severe claudication
Category 1 — mild claudication
Category 5 — minor tissue loss (Correct answer)
Category 6 — major tissue loss

Correct answer: Category 5 — minor tissue loss

Rutherford Category 5 describes ischemic rest pain with minor tissue loss such as a non-healing digital ulcer.

Question 67: Patient groups, that would be considered to have a high risk for the development of a AAA would include all, except:

Advancing age 65 years or older
Smokers
Patients with a family history of AAA
Female patients (Correct answer)

Correct answer: Female patients

Explanation: While all other options (B, C, and D) are associated with an increased risk of developing an abdominal aortic aneurysm (AAA), being female (option A) is generally considered a protective factor. AAA is more common in males, particularly those over 65 years old, with a family history of AAA, and among smokers.

Question 68: During isovolumetric contraction, which valves are CLOSED?

All four valves are closed (Correct answer)
Mitral and tricuspid valves open
Mitral and aortic valves open
Aortic and pulmonic valves open

Correct answer: All four valves are closed

During isovolumetric contraction, ventricular pressure rises but no blood is ejected; all four valves remain closed until ventricular pressure exceeds great vessel pressure.

Question 69: Which lead configuration is considered most sensitive for detecting stress-induced ischemic ST changes during exercise ECG testing?

Leads II, III, and aVF
Lead I and aVL only
Leads V4, V5, and V6 (Correct answer)
Lead aVR and V1

Correct answer: Leads V4, V5, and V6

The lateral precordial leads V4, V5, and V6 are most sensitive for detecting subendocardial ischemia during stress testing.

Question 70: Paradoxical low-flow, low-gradient aortic stenosis differs from classic low-flow, low-gradient AS by having:

Normal indexed valve area above 0.85 cm²/m²
Reduced ejection fraction below 50%
Elevated mean gradient above 40 mmHg
Preserved ejection fraction with reduced stroke volume index (Correct answer)

Correct answer: Preserved ejection fraction with reduced stroke volume index

Paradoxical LFLG AS features preserved EF (≥50%) but low stroke volume index (<35 mL/m²) due to small, hypertrophied LV with diastolic dysfunction causing low gradients despite true severe stenosis.

Question 71: Which congenital cardiac lesion most commonly produces isolated pulmonic regurgitation in adults?

Bicuspid pulmonic valve
Rheumatic heart disease involving the pulmonic valve
Carcinoid heart disease
Prior surgical or balloon repair of pulmonic stenosis or tetralogy of Fallot (Correct answer)

Correct answer: Prior surgical or balloon repair of pulmonic stenosis or tetralogy of Fallot

The most common cause of significant pulmonic regurgitation in adults is iatrogenic, resulting from prior repair of pulmonic stenosis or right ventricular outflow tract reconstruction in tetralogy of Fallot.

Question 72: Which echocardiographic view is obtained by placing the transducer at the left parasternal border to visualize the long axis of the heart?

Parasternal long-axis view (Correct answer)
Apical four-chamber view
Suprasternal notch view
Subcostal view

Correct answer: Parasternal long-axis view

The parasternal long-axis view is obtained at the left parasternal border and displays the left ventricle, mitral valve, aortic valve, and aortic root along the long axis.

Question 73: What is the corrected QT interval (QTc) formula using Bazett's correction?

QT divided by the square root of the RR interval (in seconds) (Correct answer)
QT divided by the RR interval
QT multiplied by the heart rate divided by 60
QT plus 0.04 × heart rate

Correct answer: QT divided by the square root of the RR interval (in seconds)

Bazett's formula corrects the QT interval for heart rate: QTc = QT / √RR, where RR is measured in seconds.

Question 74: Which echocardiographic finding is most specific for acute right heart failure secondary to massive pulmonary embolism?

Dilated inferior vena cava without respiratory variation
RV dilation with McConnell sign (akinetic mid free wall with preserved apical contractility) (Correct answer)
Tricuspid regurgitation with TR velocity >3 m/s
Right-to-left shunting across a patent foramen ovale

Correct answer: RV dilation with McConnell sign (akinetic mid free wall with preserved apical contractility)

McConnell sign (regional RV free wall akinesis sparing the apex) has high specificity for acute pulmonary embolism and distinguishes it from other causes of RV pressure overload.

Question 75: What is the therapeutic target INR range for patients with mechanical heart valves requiring warfarin anticoagulation (mitral position)?

1.5–2.0
3.5–4.5
2.5–3.5 (Correct answer)
2.0–3.0

Correct answer: 2.5–3.5

For mechanical mitral valve prostheses, the AHA/ACC recommended INR target is 2.5–3.5 due to higher thromboembolic risk compared to aortic position valves.

Question 76: In the context of peripheral venous evaluation, which condition is associated with May-Thurner syndrome?

Inferior vena cava compression by the aorta
Left common iliac vein compressed by the right common iliac artery (Correct answer)
Right common iliac vein compressed by the left common iliac artery
Femoral vein compression by the sartorius muscle

Correct answer: Left common iliac vein compressed by the right common iliac artery

May-Thurner syndrome occurs when the right common iliac artery crosses and compresses the left common iliac vein, predisposing to left-sided DVT.

Question 77: Which duplex ultrasound finding is MOST diagnostic of acute deep vein thrombosis (DVT)?

Increased color Doppler flow velocity
Spontaneous phasic flow present
Vein is non-compressible with direct probe pressure (Correct answer)
Vein diameter less than 3 mm

Correct answer: Vein is non-compressible with direct probe pressure

Non-compressibility of the vein under direct transducer pressure is the primary criterion for diagnosing acute DVT.

Question 78: In two-dimensional echocardiography, which method of calculating LVEF traces the endocardial border in two orthogonal apical views?

Devereux formula
Quinones method
Simpson's biplane method of discs (Correct answer)
Teichholz formula

Correct answer: Simpson's biplane method of discs

Simpson's biplane method of discs traces the endocardial border in the apical four-chamber and two-chamber views to calculate LV volumes and ejection fraction.

Question 79: The Carpentier classification for mitral regurgitation Type II refers to:

Excessive leaflet motion (prolapse or flail) (Correct answer)
Restricted leaflet motion in systole and diastole
Normal leaflet motion with annular dilation
Restricted leaflet motion in systole only

Correct answer: Excessive leaflet motion (prolapse or flail)

Carpentier Type II includes excessive leaflet motion caused by elongated or ruptured chordae tendineae or papillary muscle, producing prolapse or a flail segment.

Question 80: A 68-year-old male with a history of rheumatic heart disease presents with dyspnea on exertion. Echocardiography reveals severe tricuspid regurgitation. Which of the following quantitative parameters, derived from the PISA method, is most indicative of severe TR?

Effective Regurgitant Orifice Area (EROA) of 0.45 cm² (Correct answer)
Peak E-wave velocity of 0.8 m/s
Jet area of 8 cm²
Vena Contracta width of 4 mm

Correct answer: Effective Regurgitant Orifice Area (EROA) of 0.45 cm²

An Effective Regurgitant Orifice Area (EROA) ≥ 0.40 cm² is a specific criterion for severe tricuspid regurgitation. A vena contracta width of ≥ 7 mm is considered severe. Jet area is a less specific, qualitative measure. Peak E-wave velocity relates to diastolic function, not directly to the severity of regurgitation.

Question 81: Which finding during stress testing is considered a high-risk marker associated with severe three-vessel or left main coronary artery disease?

Isolated ST depression at peak exercise resolving within 1 minute
Sinus tachycardia with rate-related bundle branch block
ST depression confined to leads V5-V6 only
Exercise-induced ST elevation in aVR with widespread ST depression (Correct answer)

Correct answer: Exercise-induced ST elevation in aVR with widespread ST depression

ST elevation in aVR with widespread ST depression suggests diffuse subendocardial ischemia, indicating left main or proximal LAD disease.

Question 82: A patient has a normal ABI at rest but develops claudication after walking. Which test is most appropriate to evaluate for hemodynamically significant PAD?

Treadmill exercise ABI testing (Correct answer)
Venous duplex scan
Capillary refill time assessment
Computed tomography without contrast

Correct answer: Treadmill exercise ABI testing

Treadmill exercise ABI testing reveals pressure gradients across stenoses that are compensated and undetectable at rest.

Question 83: During the assessment of a mechanical mitral prosthesis, an increased mean gradient is noted. Which of the following parameters would be most useful to differentiate true stenosis from a high-flow state?

Left ventricular outflow tract (LVOT) diameter
Pressure Half-Time (PHT)
Doppler Velocity Index (DVI) (Correct answer)
Peak E-wave velocity

Correct answer: Doppler Velocity Index (DVI)

The Doppler Velocity Index (DVI), calculated as the ratio of the VTI of the prosthetic valve to the VTI of the LVOT, is a relatively flow-independent measure. In a high-flow state, both VTIs will increase, keeping the ratio relatively stable. In true stenosis, the prosthetic VTI will be disproportionately high compared to the LVOT VTI, resulting in an increased DVI (for mitral prostheses, a DVI > 2.2 may suggest dysfunction).

Question 84: A patient is found to have significant pulmonic regurgitation (PR) on a routine echocardiogram. Which of the following is an established echocardiographic criterion for classifying the PR as severe?

Regurgitant jet width <50% of the RVOT diameter
Pressure half-time (PHT) of 250 ms
Diastolic flow reversal in the branch pulmonary arteries (Correct answer)
A brief, early diastolic color Doppler jet

Correct answer: Diastolic flow reversal in the branch pulmonary arteries

The presence of diastolic flow reversal in the branch pulmonary arteries is a specific and supportive sign of severe pulmonic regurgitation. Other signs of severe PR include a dense CW signal with a steep deceleration slope (PHT <100 ms) and a wide color Doppler jet origin.

Question 85: On a lower extremity arterial duplex scan, spectral broadening within the waveform most likely indicates:

Turbulent flow associated with stenosis (Correct answer)
Normal laminar flow
Venous reflux
Arterial vasospasm

Correct answer: Turbulent flow associated with stenosis

Spectral broadening occurs when multiple velocities are present simultaneously, which is characteristic of turbulent flow at or downstream from a stenosis.

Question 86: Which color Doppler finding suggests severe mitral regurgitation?

Small central color jet <20% of left atrial area
Mild turbulence at the mitral annulus
Eccentric wall-hugging jet with vena contracta >7 mm (Correct answer)
Trace regurgitation with normal mitral inflow velocities

Correct answer: Eccentric wall-hugging jet with vena contracta >7 mm

Severe MR is suggested by an eccentric, wall-hugging Coanda jet and vena contracta width >7 mm, as central jet area alone underestimates severity of eccentric jets.

Question 87: A monitor alarm sounds, revealing a regular, wide-complex rhythm at a rate of 170 bpm. The patient becomes dizzy and hypotensive. This presentation is most consistent with which life-threatening arrhythmia?

Ventricular Tachycardia (Correct answer)
Supraventricular Tachycardia with aberrancy
Atrial Fibrillation with a rapid ventricular response
Sinus Tachycardia

Correct answer: Ventricular Tachycardia

Ventricular Tachycardia is defined as a rhythm originating in the ventricles with a rate over 100 bpm and a QRS duration of >0.12 seconds (wide complex). [6, 10, 25, 26] It is a life-threatening arrhythmia because the rapid rate and poor coordination of contraction can lead to severe hemodynamic compromise, as evidenced by the patient's dizziness and hypotension.

Question 88: The piezoelectric effect in ultrasound transducers refers to:

Reflection of sound at tissue interfaces
Conversion of electrical energy to mechanical vibration and vice versa (Correct answer)
Generation of heat from electrical current
Absorption of sound energy by tissue

Correct answer: Conversion of electrical energy to mechanical vibration and vice versa

Piezoelectric crystals deform mechanically when voltage is applied (transmit) and generate voltage when mechanically deformed by returning echoes (receive).

Question 89: What artifact occurs when a strong reflector causes repeated echo returns at equally spaced intervals?

Side lobe artifact
Acoustic shadowing
Reverberation artifact (Correct answer)
Mirror image artifact

Correct answer: Reverberation artifact

Reverberation artifacts occur when sound bounces repeatedly between two strong reflectors, creating equally spaced false echoes at multiples of the true depth.

Question 90: While performing a lower extremity arterial duplex exam, the technologist obtains a triphasic Doppler waveform in the common femoral artery. Distally, in the popliteal artery, the waveform is monophasic with a delayed systolic upstroke. What does this change in waveform most likely indicate?

A hemodynamically significant stenosis between the two sample sites (Correct answer)
A pseudoaneurysm in the distal SFA
Normal distal vasodilation after exercise
An arteriovenous fistula

Correct answer: A hemodynamically significant stenosis between the two sample sites

A normal, high-resistance peripheral artery will exhibit a triphasic or biphasic waveform. A hemodynamically significant stenosis will dampen the flow distal to the lesion, causing a loss of the reverse flow component and a delayed systolic peak. This results in a monophasic, 'tardus parvus' waveform, which is indicative of significant proximal disease.

Question 91: Which finding on intraoperative transesophageal echocardiography (TEE) after mitral valve repair would prompt the surgeon to return to bypass for revision?

Residual mitral regurgitation >2+ (moderate or greater) (Correct answer)
Trivial residual MR on color Doppler
Left ventricular EF of 55% post-bypass
Mean mitral gradient of 3 mmHg post-repair

Correct answer: Residual mitral regurgitation >2+ (moderate or greater)

Residual MR of moderate or greater severity (>2+) after mitral repair is an indication to return to cardiopulmonary bypass for revision, as significant residual MR predicts early repair failure.

Question 92: Which of the following correctly describes the transpulmonary gradient (TPG)?

Mean RAP minus mean PAP
Mean PAP minus mean PCWP (Correct answer)
Systolic PAP minus diastolic PAP
Mean PCWP minus mean RAP

Correct answer: Mean PAP minus mean PCWP

The transpulmonary gradient equals mean pulmonary artery pressure minus mean pulmonary capillary wedge pressure, reflecting resistance across the pulmonary vascular bed.

Question 93: What does an E/A ratio greater than 2 with a short deceleration time indicate in Doppler assessment of mitral inflow?

Grade I diastolic dysfunction (impaired relaxation)
Normal diastolic function
Grade III restrictive diastolic dysfunction (Correct answer)
Pseudonormal filling pattern

Correct answer: Grade III restrictive diastolic dysfunction

An E/A ratio >2 with a deceleration time <160 ms indicates Grade III (restrictive) diastolic dysfunction, suggesting elevated filling pressures.

Question 94: A patient undergoes an echocardiogram for evaluation of a heart murmur. The results show a peak aortic valve velocity of 4.5 m/s, a mean pressure gradient of 50 mmHg, and a calculated aortic valve area of 0.9 cm². According to current guidelines, how would this aortic stenosis be classified?

Severe (Correct answer)
Moderate
Critical
Mild

Correct answer: Severe

According to the American College of Cardiology/American Heart Association (ACC/AHA) and European Society of Cardiology (ESC) guidelines, severe aortic stenosis is defined by a peak velocity >4 m/s, a mean gradient >40 mmHg, and an aortic valve area <1.0 cm². This patient's findings all fall within the 'severe' category.

Question 95: A patient with hypertrophic obstructive cardiomyopathy (HOCM) undergoes catheterization. Which maneuver will increase the outflow tract gradient?

Handgrip exercise to increase afterload
Administration of phenylephrine to increase afterload
Passive leg raise to increase preload
Valsalva maneuver or standing (decreased preload) (Correct answer)

Correct answer: Valsalva maneuver or standing (decreased preload)

The Valsalva maneuver decreases LV preload (venous return), which reduces LV cavity size and worsens dynamic LVOT obstruction in HOCM.

Question 96: Increasing pulse repetition frequency (PRF) in pulsed wave Doppler will:

Increase maximum measurable depth
Decrease the Doppler shift
Reduce temporal resolution
Increase the Nyquist limit, allowing measurement of higher velocities before aliasing (Correct answer)

Correct answer: Increase the Nyquist limit, allowing measurement of higher velocities before aliasing

Higher PRF means more samples per second; since the Nyquist limit = PRF/2, higher PRF raises the aliasing threshold and allows measurement of faster velocities.

Question 97: Which of the following represents an absolute contraindication to exercise stress testing?

Uncontrolled symptomatic heart failure with resting dyspnea (Correct answer)
Moderate mitral regurgitation with preserved LVEF
Stable angina pectoris with recent symptoms
Hypertension with BP 150/90 on medications

Correct answer: Uncontrolled symptomatic heart failure with resting dyspnea

Decompensated heart failure with active symptoms at rest is an absolute contraindication to exercise stress testing due to risk of acute decompensation.

Question 98: Systolic anterior motion (SAM) of the mitral valve leaflet in hypertrophic obstructive cardiomyopathy (HOCM) causes which valvular complication?

Dynamic left ventricular outflow tract obstruction with associated mitral regurgitation (Correct answer)
Mitral stenosis
Pulmonic stenosis
Aortic regurgitation

Correct answer: Dynamic left ventricular outflow tract obstruction with associated mitral regurgitation

SAM pulls the anterior mitral leaflet into the LVOT during systole, creating dynamic obstruction and an associated posteriorly directed MR jet.

Question 99: A finding of 'spontaneous' venous flow on duplex ultrasound means:

Flow appears only after distal augmentation
Flow is detected only with color Doppler, not spectral
Flow reverses spontaneously during quiet respiration
Flow is present without any patient maneuver or compression (Correct answer)

Correct answer: Flow is present without any patient maneuver or compression

Spontaneous venous flow is detected at rest without requiring augmentation, indicating adequate venous patency and flow volume.

Question 100: A patient with sarcoidosis has a dilated left ventricle with basal septal thinning and dyskinesis but preserved apical function. This regional pattern is MOST characteristic of:

Left anterior descending artery territory infarction
Non-ischemic cardiomyopathy with basal predominance (Correct answer)
Apical hypertrophic cardiomyopathy
Takotsubo (stress) cardiomyopathy

Correct answer: Non-ischemic cardiomyopathy with basal predominance

Sarcoid cardiomyopathy classically produces a non-ischemic pattern with basal and septal wall motion abnormalities that do not follow a coronary artery distribution.

Question 101: Increasing the gain on an ultrasound system primarily affects:

The depth of field
The frequency of transmitted pulses
The amplification of returning echo signals (Correct answer)
The pulse repetition frequency

Correct answer: The amplification of returning echo signals

Gain uniformly amplifies all returning echo signals electronically without changing transmission power or depth penetration.

Question 102: What happens to the Doppler angle as it approaches 90 degrees relative to blood flow?

Measured velocity approaches zero regardless of true velocity (Correct answer)
Aliasing is eliminated
Measured velocity increases toward its true value
The PRF must be decreased

Correct answer: Measured velocity approaches zero regardless of true velocity

The Doppler equation includes the cosine of the angle; at 90°, cos(90°) = 0, so the detected Doppler shift becomes zero regardless of actual blood velocity.

Question 103: A patient experiences chest pain and 3 mm downsloping ST depression in leads V4-V6 at 5 METs on a treadmill test. According to Duke Treadmill Score, which risk category does this represent?

Intermediate risk
Low risk
High risk (Correct answer)
Indeterminate — insufficient data

Correct answer: High risk

A Duke Treadmill Score ≤ -11 (calculated from exercise time, ST deviation, and angina index) corresponds to high risk with significant ST depression at low workload.

Question 104: Which of the following is the most common cause of aortic stenosis in patients younger than 70 years in the United States?

Rheumatic disease
Bicuspid aortic valve disease (Correct answer)
Degenerative calcific disease
Infective endocarditis

Correct answer: Bicuspid aortic valve disease

Bicuspid aortic valve, occurring in 1–2% of the population, is the most common cause of aortic stenosis requiring surgery in patients under 70 years of age in developed countries.

Question 105: What does the tissue Doppler imaging (TDI) parameter e' (e-prime) measure?

Peak aortic outflow velocity
Isovolumic relaxation time
Early diastolic myocardial relaxation velocity at the mitral annulus (Correct answer)
Peak systolic myocardial contraction velocity

Correct answer: Early diastolic myocardial relaxation velocity at the mitral annulus

TDI e' measures early diastolic myocardial velocity at the mitral annulus (septal or lateral), reflecting myocardial relaxation and used to estimate LV filling pressures via E/e' ratio.

Question 106: Which artifact on echocardiography is caused by two strong specular reflectors and produces a false image at twice the true depth of a structure?

Acoustic shadowing
Near-field clutter
Reverberation artifact (Correct answer)
Side-lobe artifact

Correct answer: Reverberation artifact

Reverberation artifacts occur when the ultrasound beam bounces repeatedly between two strong reflectors, generating false echoes at multiples of the true depth.

Question 107: Which echocardiographic technique measures myocardial deformation to detect subtle dysfunction before overt wall motion abnormalities?

Continuous wave Doppler
Anatomical M-mode
M-mode echocardiography
Speckle tracking strain imaging (Correct answer)

Correct answer: Speckle tracking strain imaging

Speckle tracking strain imaging tracks acoustic speckles frame-to-frame to quantify myocardial deformation (strain), detecting subclinical dysfunction earlier than visual wall motion assessment.

Question 108: A rhythm strip shows irregularly irregular narrow QRS complexes with no discernible P waves and a wavy baseline. What is the diagnosis?

Atrial flutter
Atrial fibrillation (Correct answer)
Multifocal atrial tachycardia
Junctional tachycardia

Correct answer: Atrial fibrillation

Atrial fibrillation produces an irregularly irregular ventricular response, absent organized P waves, and a fibrillatory baseline.

Question 109: In severe aortic stenosis, which hemodynamic finding indicates the poorest prognosis without intervention?

Syncope with exertion (Correct answer)
Mild concentric LV hypertrophy
Asymptomatic with AVA 0.95 cm²
Peak gradient of 40 mmHg

Correct answer: Syncope with exertion

The classic triad of symptoms in AS (angina, syncope, heart failure) signals decompensation; exertional syncope carries a mean survival of approximately 3 years without valve replacement.

Question 110: Which pharmacological agent used in stress testing works by causing coronary vasodilation through A2A adenosine receptor agonism?

Regadenoson (Correct answer)
Metoprolol
Atropine
Dobutamine

Correct answer: Regadenoson

Regadenoson is a selective A2A adenosine receptor agonist that causes coronary vasodilation and is used as a pharmacological stress agent.

Question 111: Which statement about continuous wave (CW) Doppler is correct?

It can measure very high velocities without aliasing (Correct answer)
It uses a single pulsing crystal
It has a maximum velocity limit set by the Nyquist theorem
It has range resolution and can pinpoint sample depth

Correct answer: It can measure very high velocities without aliasing

CW Doppler continuously transmits and receives without pulsing, so it has no PRF limit and can accurately measure very high velocities without aliasing.

Question 112: Which duplex finding is the BEST indicator to differentiate ICA occlusion from severe near-total occlusion when color Doppler shows no flow?

Presence of calcification on B-mode at the ICA origin
Absent temporal tap response in the ipsilateral ECA
High-resistance waveform in the ipsilateral CCA
Detection of a trickle of flow using power Doppler or contrast-enhanced ultrasound (Correct answer)

Correct answer: Detection of a trickle of flow using power Doppler or contrast-enhanced ultrasound

Power Doppler or CEUS can detect residual trickle flow in near-occlusion that conventional color Doppler misses, changing patient management.

Question 113: Which Doppler modality uses a sample volume placed at a fixed depth and provides spectral analysis of flow at that specific location?

Pulsed wave Doppler (Correct answer)
Tissue Doppler imaging
Continuous wave Doppler
Color flow Doppler

Correct answer: Pulsed wave Doppler

Pulsed wave Doppler uses a sample volume at a specific depth with range resolution, allowing interrogation of flow at a precise location but limited by the Nyquist limit.

Question 114: In a normal adult heart, the QRS complex duration should not exceed:

200 ms (0.20 sec)
160 ms (0.16 sec)
80 ms (0.08 sec)
120 ms (0.12 sec) (Correct answer)

Correct answer: 120 ms (0.12 sec)

Normal QRS duration is 60–100 ms; a QRS ≥120 ms indicates abnormal ventricular conduction (bundle branch block or ventricular origin).

Question 115: In 3D echocardiography, what is the primary advantage over 2D echo for left ventricular volume assessment?

It is faster to acquire
It has better temporal resolution
It eliminates geometric assumptions and foreshortening of the LV apex (Correct answer)
It does not require ECG gating

Correct answer: It eliminates geometric assumptions and foreshortening of the LV apex

3D echocardiography acquires the full LV volume without relying on geometric models, eliminating foreshortening and providing more accurate and reproducible volume measurements.

Question 116: A duplex scan reveals a focal aneurysm of the popliteal artery measuring 2.5 cm. Which complication is most commonly associated with popliteal artery aneurysms?

Arteriovenous fistula formation
Thromboembolism causing acute limb ischemia (Correct answer)
Spontaneous rupture
Vessel wall dissection

Correct answer: Thromboembolism causing acute limb ischemia

Popliteal artery aneurysms most commonly cause limb-threatening thromboembolism rather than rupture.

Question 117: What is the primary role of the Allen test prior to transradial cardiac catheterization?

Determining the patency of the brachial artery
Assessing radial artery diameter to select sheath size
Measuring radial artery blood pressure for baseline comparison
Confirming adequate ulnar collateral circulation to the hand before radial artery cannulation (Correct answer)

Correct answer: Confirming adequate ulnar collateral circulation to the hand before radial artery cannulation

The Allen test assesses ulnar artery collateral flow to ensure the hand will remain perfused if the radial artery becomes occluded during or after the procedure.

Question 118: A sonographer identifies atherosclerotic plaque in the carotid bifurcation that appears brightly echogenic and produces a strong posterior acoustic shadow, obscuring the vessel wall behind it. How is this type of plaque best characterized?

Calcified
Soft
Ulcerated (Correct answer)
Homogeneous

Correct answer: Ulcerated

Markedly hyperechoic (bright) plaque that causes posterior acoustic shadowing is characteristic of calcified plaque. [6, 12] The dense calcium deposits do not allow the ultrasound beam to pass through, creating a shadow behind the plaque. Soft plaques are typically hypoechoic, and homogeneous plaques have a uniform texture without significant shadowing. [6]

Question 119: What finding on echo Doppler is used to non-invasively estimate right ventricular systolic pressure (RVSP)?

Tricuspid annular plane systolic excursion (TAPSE)
Peak tricuspid regurgitation jet velocity using the modified Bernoulli equation (Correct answer)
Pulmonary valve deceleration time
Right ventricular outflow tract diameter

Correct answer: Peak tricuspid regurgitation jet velocity using the modified Bernoulli equation

RVSP is estimated by applying the modified Bernoulli equation (4v²) to the peak TR jet velocity and adding estimated right atrial pressure.

Question 120: In duplex evaluation of suspected upper extremity DVT, which vein is MOST commonly affected by catheter-related thrombosis?

Subclavian or axillary vein (Correct answer)
Basilic vein at the elbow
Cephalic vein at the shoulder
Internal jugular vein

Correct answer: Subclavian or axillary vein

Catheter-related upper extremity DVT most commonly involves the subclavian or axillary vein due to central line placement routes.

Question 121: Which finding would indicate a hemodynamically significant proximal CCA stenosis or occlusion on duplex examination?

Normal CCA waveform with spectral broadening at the bulb
Increased ICA/CCA PSV ratio
Dampened, low-velocity, tardus-parvus waveform distal to the stenosis (Correct answer)
Elevated PSV in the ipsilateral ICA

Correct answer: Dampened, low-velocity, tardus-parvus waveform distal to the stenosis

Significant proximal CCA obstruction produces a tardus-parvus (slow-rising, rounded systolic peak with reduced amplitude) waveform distal to the lesion.

Question 122: In lower extremity arterial occlusion, which collateral pathway most commonly reconstitutes the popliteal artery?

Lateral circumflex femoral artery
Peroneal communicating branches
Profunda femoris perforators
Geniculate anastomosis around the knee (Correct answer)

Correct answer: Geniculate anastomosis around the knee

The geniculate arteries form an anastomotic network around the knee that reconstitutes the popliteal artery distal to a femoral occlusion.

Question 123: What is the primary advantage of harmonic imaging over fundamental imaging in echocardiography?

Higher frame rate
Increased temporal resolution
Better far-field penetration at low frequencies
Reduced side lobe artifacts and improved endocardial border definition (Correct answer)

Correct answer: Reduced side lobe artifacts and improved endocardial border definition

Harmonic imaging uses the second harmonic frequency generated by tissue, reducing near-field artifacts and side lobes to improve endocardial border visualization.

Question 124: During a right heart catheterization, the equalization of end-diastolic pressures across all four cardiac chambers (e.g., RA, RV, PA diastolic, and PCWP are all within 5 mmHg of each other) is a classic hemodynamic sign of which condition?

Aortic stenosis
Mitral regurgitation
Constrictive pericarditis (Correct answer)
Restrictive cardiomyopathy

Correct answer: Constrictive pericarditis

Constrictive pericarditis is characterized by a rigid, non-compliant pericardium that encases the heart and limits diastolic filling for all chambers equally. This results in the hallmark hemodynamic finding of elevated and equalized end-diastolic pressures. [14, 16] While restrictive cardiomyopathy can have some similar features, the classic and most defining characteristic of equalization points to constriction. [16, 20]

Question 125: In a patient with a bicuspid aortic valve, which associated cardiovascular abnormality must be routinely assessed?

Pericardial constriction
Aortic root and ascending aorta dilation (Correct answer)
Mitral valve prolapse
Left ventricular non-compaction

Correct answer: Aortic root and ascending aorta dilation

Bicuspid aortic valve is associated with medial degeneration of the aortic wall, predisposing to aortic root and ascending aorta aneurysm independent of valve dysfunction.

Question 126: What is the significance of a high-thigh pressure that is lower than the brachial pressure in segmental limb pressure testing?

Indicates common femoral artery disease
Suggests aortoiliac occlusive disease (Correct answer)
Suggests popliteal artery disease
Normal finding in elderly patients

Correct answer: Suggests aortoiliac occlusive disease

A high-thigh pressure lower than brachial pressure indicates inflow disease at the aortoiliac level.

Question 127: The hepatic vein Doppler waveform shows blunted systolic filling fraction and systolic flow reversal. This pattern is MOST consistent with:

Severe tricuspid regurgitation (Correct answer)
Constrictive pericarditis
Severe mitral regurgitation
Cardiac tamponade

Correct answer: Severe tricuspid regurgitation

Severe tricuspid regurgitation causes systolic flow reversal in the hepatic veins as regurgitant volume is transmitted backward into the right atrium and venous system.

Question 128: Which finding on color Doppler distinguishes functional from organic mitral regurgitation?

Central jet in functional vs. eccentric jet in organic (Correct answer)
Eccentric jet in functional vs. central jet in organic
Jet area is always larger in organic MR
Vena contracta is always wider in functional MR

Correct answer: Central jet in functional vs. eccentric jet in organic

Functional MR produces a central regurgitant jet due to symmetric leaflet tethering, while organic MR from leaflet prolapse typically produces an eccentric jet directed away from the prolapsing leaflet.

Question 129: What is the reversal agent for adenosine-induced severe bronchospasm or hypotension during pharmacological stress testing?

Aminophylline 50-100 mg IV (Correct answer)
Atropine 0.5 mg IV
Metoprolol 5 mg IV
Epinephrine 1 mg IV

Correct answer: Aminophylline 50-100 mg IV

Aminophylline (theophylline) competitively antagonizes adenosine receptors and rapidly reverses adenosine-induced side effects.

Question 130: What is the significance of a left ventricular wall motion score index (WMSI) greater than 1.0 on stress echocardiography?

Normal myocardial function throughout
Right ventricular pressure overload
Hyperdynamic left ventricular function
Evidence of regional wall motion abnormalities suggesting ischemia or infarction (Correct answer)

Correct answer: Evidence of regional wall motion abnormalities suggesting ischemia or infarction

A WMSI >1.0 indicates that at least one segment has abnormal wall motion (hypokinesis, akinesis, or dyskinesis), suggesting ischemia or prior infarction.

Question 131: In M-mode echocardiography, which measurement is used to calculate left ventricular ejection fraction using the Teichholz method?

Right ventricular diameter
Left ventricular end-diastolic and end-systolic dimensions (Correct answer)
Mitral valve E-point septal separation only
Peak aortic velocity

Correct answer: Left ventricular end-diastolic and end-systolic dimensions

The Teichholz method uses left ventricular end-diastolic dimension (LVEDD) and end-systolic dimension (LVESD) from M-mode to calculate ejection fraction.

Question 132: Ventricular compliance refers to:

Stroke volume per unit of heart rate
The rate of myocardial relaxation after systole
The ventricle's ability to change volume in response to a change in pressure (Correct answer)
The maximum pressure the ventricle can generate

Correct answer: The ventricle's ability to change volume in response to a change in pressure

Compliance (ΔV/ΔP) describes how easily the ventricle distends; a stiff (non-compliant) ventricle requires higher filling pressures to achieve the same end-diastolic volume.

Question 133: Which hemodynamic parameter is calculated by dividing cardiac output by mean arterial pressure minus central venous pressure?

Cardiac index
Stroke volume
Systemic vascular resistance (Correct answer)
Pulmonary vascular resistance

Correct answer: Systemic vascular resistance

Systemic vascular resistance (SVR) = (MAP – CVP) / CO × 80, expressed in dynes·sec/cm⁵, reflecting the total resistance the left ventricle must overcome.

Question 134: Which of the following best describes the sonographic appearance of a carotid body tumor on duplex imaging?

Hypervascular mass splaying the ICA and ECA at the bifurcation with high diastolic flow (Correct answer)
Anechoic cystic structure compressing the CCA
Calcified plaque at the bifurcation with posterior shadowing
Hyperechoic mass anterior to the carotid bifurcation

Correct answer: Hypervascular mass splaying the ICA and ECA at the bifurcation with high diastolic flow

Carotid body tumors (paragangliomas) appear as hypervascular solid masses that splay the ICA and ECA apart, demonstrating high-flow Doppler signals.

Question 135: A patient with aortic stenosis has an LVOT diameter of 2.0 cm, LVOT VTI of 18 cm, and AV VTI of 90 cm. What is the calculated aortic valve area?

0.63 cm² (Correct answer)
0.80 cm²
1.57 cm²
1.26 cm²

Correct answer: 0.63 cm²

AVA = π×(1.0)²×18/90 = 3.14×0.18 = 0.63 cm², indicating severe aortic stenosis (AVA <1.0 cm²).

Question 136: What is the normal left ventricular ejection fraction (LVEF) range according to American Society of Echocardiography (ASE) guidelines?

60–70%
≥55% (Correct answer)
45–55%
40–50%

Correct answer: ≥55%

ASE guidelines define normal LVEF as ≥55%, with mildly reduced EF at 41–54%, moderately reduced at 30–40%, and severely reduced at <30%.

Question 137: During exercise stress testing, which blood pressure response is considered abnormal and associated with increased cardiovascular risk?

Systolic BP rise of 40 mmHg at peak exercise
Failure of systolic BP to rise above 10 mmHg from rest during maximal exercise (Correct answer)
Diastolic BP increase of 10 mmHg during exercise
Systolic BP of 180 mmHg at peak exercise in a hypertensive patient

Correct answer: Failure of systolic BP to rise above 10 mmHg from rest during maximal exercise

Exertional hypotension or a flat BP response (rise <10 mmHg) suggests severe LV dysfunction or significant left main/proximal multi-vessel disease.

Question 138: The acceleration time (AT) measured in intrarenal arteries is prolonged when:

The patient is dehydrated
There is significant proximal renal artery stenosis (Correct answer)
There is an intrarenal arteriovenous malformation
Renal vein thrombosis is present

Correct answer: There is significant proximal renal artery stenosis

Significant renal artery stenosis dampens the waveform, prolonging the time from onset of systole to peak systolic velocity (AT > 70–80 ms).

Question 139: What is the primary purpose of using power Doppler (energy Doppler) instead of color flow Doppler during carotid duplex?

To determine flow direction
To detect very slow flow in a near-total occlusion (Correct answer)
To assess spectral waveform morphology
To measure peak systolic velocity

Correct answer: To detect very slow flow in a near-total occlusion

Power Doppler is highly sensitive to slow flow and is used to differentiate near-occlusion from complete occlusion where color Doppler may miss a trickle of flow.

Question 140: Which anticoagulant is most commonly used during percutaneous coronary intervention (PCI) due to its immediate onset and reversibility with protamine?

Heparin (unfractionated) (Correct answer)
Warfarin
Dabigatran
Rivaroxaban

Correct answer: Heparin (unfractionated)

Unfractionated heparin (UFH) is standard anticoagulation during PCI due to its immediate action, short half-life, ability to monitor with ACT, and reversibility with protamine sulfate.

Question 141: When evaluating the great saphenous vein (GSV), which anatomical landmark identifies its junction with the common femoral vein?

Adductor canal
Mid-thigh perforator level
Saphenofemoral junction (SFJ) at the groin crease (Correct answer)
Popliteal fossa at the knee

Correct answer: Saphenofemoral junction (SFJ) at the groin crease

The saphenofemoral junction (SFJ) is located near the groin crease where the GSV drains into the common femoral vein.

Question 142: A patient has a peak aortic valve gradient of 52 mmHg with an AVA of 0.9 cm² but an LVEF of 30%. How should this be classified?

Low-flow, low-gradient severe AS (Correct answer)
High-gradient severe AS
Moderate aortic stenosis
Pseudosevere aortic stenosis

Correct answer: Low-flow, low-gradient severe AS

Reduced stroke volume from low EF produces low gradients despite true severe stenosis, classifying this as low-flow, low-gradient severe AS requiring dobutamine stress echo for confirmation.

Question 143: Which mode of echocardiography provides the highest temporal resolution for cardiac motion analysis?

3D echocardiography
M-mode (Correct answer)
2D imaging
Color flow Doppler

Correct answer: M-mode

M-mode records a single line of information at a very high frame rate (typically 1,000 frames/sec), providing superior temporal resolution for cardiac motion.

Question 144: In venous hemodynamics, which maneuver is used to assess valve competence during duplex ultrasound?

Hyperventilation
Passive leg elevation
Valsalva maneuver (Correct answer)
Breath-hold at end inspiration

Correct answer: Valsalva maneuver

Valsalva maneuver increases intra-abdominal pressure and abolishes normal venous flow; reflux upon release indicates valve incompetence.

Question 145: When performing an arterial duplex of the lower extremity, which transducer frequency is most appropriate for imaging the deep femoral (profunda femoris) artery in an obese patient?

7.5–10 MHz
3–5 MHz (Correct answer)
1–2 MHz
12–15 MHz

Correct answer: 3–5 MHz

A lower frequency of 3–5 MHz provides greater tissue penetration needed to image deep vessels in obese patients despite reduced resolution.

Question 146: A sonographer performs a carotid duplex exam and obtains the following measurements in the left internal carotid artery (ICA): Peak Systolic Velocity (PSV) = 255 cm/s, End-Diastolic Velocity (EDV) = 110 cm/s, and an ICA/CCA PSV ratio of 4.5. Based on the Society of Radiologists in Ultrasound (SRU) consensus criteria, what is the estimated degree of stenosis?

≥70% stenosis to near occlusion (Correct answer)
<50% stenosis
50-69% stenosis
Total occlusion

Correct answer: ≥70% stenosis to near occlusion

According to the widely accepted SRU consensus criteria, an ICA Peak Systolic Velocity (PSV) greater than 230 cm/s is a primary indicator for a stenosis of ≥70%. [17, 26] The additional findings of an End-Diastolic Velocity (EDV) >100 cm/s and an ICA/CCA PSV ratio >4.0 further support this conclusion, placing the stenosis in the ≥70% to near occlusion category. [17]

Question 147: Which part of the brain helps to control the person's respiration and heart rate?

Temporal lobe
Occipital lobe
Cerebrum
Medulla oblongata (Correct answer)

Correct answer: Medulla oblongata

Explanation: The medulla oblongata, located at the base of the brainstem, plays a crucial role in regulating vital functions such as respiration and heart rate. It contains centers responsible for controlling breathing rhythm and heart rate, among other autonomic functions.

Question 148: Which Doppler finding is most characteristic of severe mitral stenosis?

Pressure half-time >220 ms (Correct answer)
Pressure half-time <100 ms
Deceleration time >280 ms
E/A ratio <1.0

Correct answer: Pressure half-time >220 ms

A pressure half-time greater than 220 ms corresponds to a mitral valve area of approximately 1.0 cm² or less, indicating severe mitral stenosis.

Question 149: Which radiation protection principle states that dose decreases with the square of the distance from the source?

ALARA
Dose-response relationship
Inverse square law (Correct answer)
Half-value layer

Correct answer: Inverse square law

The inverse square law means doubling your distance from the X-ray source reduces radiation exposure to one-quarter.

Question 150: An 85-year-old patient cannot exercise adequately for treadmill testing and has a documented theophylline allergy. Which pharmacological stress agent is most appropriate?

Dobutamine — acts via adrenergic receptors, unaffected by adenosine antagonism or theophylline allergy (Correct answer)
Dipyridamole — no adenosine receptor involvement
Adenosine — rapid half-life minimizes cumulative dose concerns
Regadenoson — theophylline allergy does not preclude its use

Correct answer: Dobutamine — acts via adrenergic receptors, unaffected by adenosine antagonism or theophylline allergy

Dobutamine works through beta-adrenergic stimulation rather than adenosine receptor pathways, making it the appropriate agent when adenosine-based agents are contraindicated or when aminophylline reversal is unavailable due to allergy.

Question 151: Which class of antiarrhythmic drugs blocks sodium channels and is classified as Class I according to the Vaughan Williams classification?

Calcium channel blockers (e.g., verapamil)
Sodium channel blockers (e.g., lidocaine, flecainide) (Correct answer)
Potassium channel blockers (e.g., amiodarone)
Beta-blockers (e.g., metoprolol)

Correct answer: Sodium channel blockers (e.g., lidocaine, flecainide)

Vaughan Williams Class I antiarrhythmics (e.g., lidocaine, flecainide, procainamide) block fast sodium channels, slowing phase 0 depolarization and conduction velocity.

Question 152: Which safety concern is unique to transesophageal echocardiography (TEE) compared to transthoracic echocardiography (TTE)?

Excessive radiation exposure
Risk of esophageal perforation and aspiration (Correct answer)
Contrast agent anaphylaxis
Ultrasound bioeffects on myocardial tissue

Correct answer: Risk of esophageal perforation and aspiration

TEE requires esophageal intubation, introducing risks of esophageal perforation, laryngospasm, aspiration, and complications related to sedation not present with TTE.

Question 153: When assessing a patient for mitral valve prolapse (MVP) using 2D echocardiography, which view is considered essential for minimizing false positives and confirming the diagnosis?

Subcostal
Parasternal short-axis
Apical four-chamber
Parasternal long-axis (Correct answer)

Correct answer: Parasternal long-axis

The parasternal long-axis view is crucial for diagnosing mitral valve prolapse. This view avoids the saddle-shape of the mitral annulus which can cause a false positive appearance of prolapse in the apical four-chamber view. True MVP is defined as systolic displacement of one or both mitral leaflets >2 mm above the mitral annular plane in the parasternal long-axis view.

Question 154: Which maneuver is MOST effective for demonstrating reflux in the small saphenous vein (SSV) at the popliteal fossa?

Patient performs 10 calf raises
Proximal thigh tourniquet application
Distal foot compression only
Calf compression and release while patient stands (Correct answer)

Correct answer: Calf compression and release while patient stands

Calf compression with rapid release in the standing patient creates the pressure reversal needed to demonstrate SSV valve incompetence at the popliteal level.

Question 155: During a transesophageal echocardiogram (TEE), which structure is best visualized in the mid-esophageal four-chamber view?

Descending thoracic aorta
All four cardiac chambers and AV valves (Correct answer)
Aortic arch
Left atrial appendage

Correct answer: All four cardiac chambers and AV valves

The mid-esophageal four-chamber view at approximately 0 degrees displays all four chambers, the mitral valve, tricuspid valve, and interatrial septum simultaneously.

Question 156: Which sonographic sign is used to detect a Baker's cyst (popliteal cyst) that may mimic DVT symptoms?

Non-compressible popliteal vein with absent color flow
Hyperechoic calcified plaque along the vein wall
Echogenic intraluminal material within the popliteal vein
Anechoic or hypoechoic fluid-filled structure posterior to the knee communicating with the joint (Correct answer)

Correct answer: Anechoic or hypoechoic fluid-filled structure posterior to the knee communicating with the joint

A Baker's cyst appears as a fluid-filled structure between the medial head of the gastrocnemius and semimembranosus, often communicating with the knee joint.

Question 157: What does the 'Brockenbrough-Braunwald-Morrow sign' demonstrate during catheterization?

Equalization of diastolic pressures after pericardiocentesis
Decreased LVEDP following contrast ventriculography
Increased post-extrasystolic LV systolic pressure with decreased aortic pulse pressure — pathognomonic of HOCM (Correct answer)
Increase in PCWP following rapid fluid challenge

Correct answer: Increased post-extrasystolic LV systolic pressure with decreased aortic pulse pressure — pathognomonic of HOCM

The Brockenbrough sign shows that after a premature ventricular beat, LV systolic pressure increases while aortic pulse pressure paradoxically decreases, pathognomonic for dynamic LVOT obstruction in HOCM.

Question 158: The statement that would best describe a "comet tail" would be considered which of the following?

A bit
A sequential display of all the frames that are stored in memory at a controllable frame rate.
A crystal
A series of closely spaced reverberation echoes. (Correct answer)

Correct answer: A series of closely spaced reverberation echoes.

Explanation: A "comet tail" in ultrasound imaging refers to a series of closely spaced reverberation echoes seen beyond a strongly reflective structure, resembling the tail of a comet. This artifact is caused by multiple reflections of sound waves within a highly reflective structure, leading to closely spaced echoes seen deeper in the tissue.

Question 159: In a stenotic vessel, the pressure gradient across the lesion is primarily determined by:

Red blood cell deformability
Plasma viscosity alone
Vessel wall compliance
Flow velocity and lesion geometry (Correct answer)

Correct answer: Flow velocity and lesion geometry

The pressure gradient across a stenosis depends on flow velocity squared and the geometric characteristics of the narrowing.

Question 160: In a patient with severe mitral regurgitation, which finding on color Doppler indicates a proximal isovelocity surface area (PISA) radius appropriate for calculating effective regurgitant orifice area?

Vena contracta width >7 mm
An eccentric jet impinging on the posterior left atrial wall
A hemispheric flow convergence zone proximal to the mitral valve (Correct answer)
Pulmonary vein systolic flow reversal

Correct answer: A hemispheric flow convergence zone proximal to the mitral valve

PISA method requires identifying a hemispheric convergence zone of accelerating flow proximal to the regurgitant orifice, which is then used with aliasing velocity to calculate EROA.

Question 161: The mechanical index (MI) displayed on an ultrasound machine is most closely associated with the risk of:

Electrical interference
Reverberation artifacts
Cavitation and non-thermal mechanical bioeffects (Correct answer)
Thermal heating of tissue

Correct answer: Cavitation and non-thermal mechanical bioeffects

MI = peak negative pressure / √frequency; higher MI values indicate greater potential for cavitation and non-thermal mechanical bioeffects.

Question 162: The PISA (proximal isovelocity surface area) method assumes that the convergence zone proximal to a regurgitant orifice has what geometric shape?

Ellipsoid
Cylindrical tube
Hemispheric shell (Correct answer)
Flat disk

Correct answer: Hemispheric shell

PISA assumes that blood converges toward a regurgitant orifice in concentric hemispheric shells of equal velocity, allowing flow rate calculation as 2π × r² × aliasing velocity.

Question 163: A patient with mitral valve prolapse and a flail posterior leaflet has a regurgitant volume of 72 mL/beat. According to ASE guidelines, this represents:

Moderate mitral regurgitation (30–59 mL/beat)
Mild mitral regurgitation (<30 mL/beat)
Moderate-to-severe mitral regurgitation (45–59 mL/beat)
Severe mitral regurgitation (≥60 mL/beat) (Correct answer)

Correct answer: Severe mitral regurgitation (≥60 mL/beat)

Regurgitant volume ≥60 mL per beat meets the quantitative threshold for severe mitral regurgitation according to 2017 ASE valve guidelines.

Question 164: In a patient with aortic regurgitation, which echocardiographic measurement is most predictive of the need for surgical intervention?

Regurgitant fraction >30%
Left ventricular end-systolic diameter >50 mm (Correct answer)
Vena contracta width >4 mm
Left ventricular end-diastolic diameter >55 mm

Correct answer: Left ventricular end-systolic diameter >50 mm

An LV end-systolic diameter greater than 50 mm (or indexed >25 mm/m²) is a Class I indication for surgery in asymptomatic severe aortic regurgitation per ACC/AHA guidelines.

Question 165: In the evaluation of a bioprosthetic aortic valve, which of the following Doppler findings is most suggestive of significant prosthetic valve stenosis?

Peak velocity of 2.5 m/s
Doppler Velocity Index (DVI) of 0.5
Triangular, early-peaking CW Doppler profile
Acceleration time (AT) > 100 ms (Correct answer)

Correct answer: Acceleration time (AT) > 100 ms

An acceleration time (AT) greater than 100 ms, along with a more rounded, late-peaking CW Doppler profile, is a strong indicator of prosthetic aortic valve stenosis. While peak velocities are often increased in normally functioning prosthetic valves, an AT >100 ms is more specific for obstruction. A DVI < 0.25 is indicative of stenosis; 0.5 is normal. A triangular, early-peaking profile is characteristic of a non-stenotic valve.

Question 166: What is the minimum recommended systolic blood pressure threshold at which exercise stress testing should be terminated to prevent hypertensive emergency?

200 mmHg
220 mmHg (Correct answer)
180 mmHg
250 mmHg

Correct answer: 220 mmHg

A systolic BP exceeding 220 mmHg during exercise is a relative indication to stop; >250 mmHg is considered a threshold for mandatory termination to prevent hypertensive crisis.

Question 167: The Thebesian veins drain directly into which cardiac structures?

Right atrium and right ventricle only
Left ventricle and right ventricle only
All four cardiac chambers (Correct answer)
Coronary sinus only

Correct answer: All four cardiac chambers

Thebesian veins (venae cordis minimae) are small veins in the walls of all four chambers that drain a small amount of myocardial venous blood directly into the cardiac chambers.

Question 168: The resistive index (RI) is calculated as:

(PSV − EDV) / EDV
EDV / PSV
(PSV + EDV) / mean velocity
(PSV − EDV) / PSV (Correct answer)

Correct answer: (PSV − EDV) / PSV

RI = (peak systolic velocity − end diastolic velocity) / peak systolic velocity, ranging from 0 to 1.

Question 169: When sector width is reduced on a 2D echocardiographic image, the primary benefit is:

Wider field of view
Reduced gain requirement
Improved penetration depth
Increased frame rate (Correct answer)

Correct answer: Increased frame rate

A narrower sector requires fewer scan lines per frame, allowing the system to update the image more frequently and increasing frame rate.

Question 170: Which ECG feature best distinguishes Wolff-Parkinson-White (WPW) syndrome from a bundle branch block?

ST depression in lateral leads
Prolonged QT interval
Delta wave and short PR interval (Correct answer)
Wide QRS and tall R wave

Correct answer: Delta wave and short PR interval

WPW is characterized by a delta wave (slurred QRS upstroke) and a short PR interval (<0.12 sec) due to accessory pathway pre-excitation.

Question 171: Which hemodynamic change occurs during exercise in a patient with hemodynamically significant PAD?

ABI decreases due to inability to raise distal pressure (Correct answer)
Collateral flow eliminates the exercise-induced pressure drop
Ankle pressure rises proportionally with brachial pressure
ABI increases due to improved cardiac output

Correct answer: ABI decreases due to inability to raise distal pressure

During exercise, vasodilation increases flow demand but the stenosis limits pressure transmission, causing ankle pressure to fall and ABI to decrease.

Question 172: Which prosthetic valve type is preferred for a 35-year-old woman who desires future pregnancy and wants to avoid long-term anticoagulation?

There is no perfect option; mechanical valves require anticoagulation (teratogenic warfarin risk) while bioprosthetic valves degenerate faster in young patients (Correct answer)
Mechanical valve with aspirin alone
Bioprosthetic valve without any anticoagulation
Transcatheter valve-in-valve

Correct answer: There is no perfect option; mechanical valves require anticoagulation (teratogenic warfarin risk) while bioprosthetic valves degenerate faster in young patients

Both valve types present challenges: mechanical valves require warfarin (risk of fetal loss/embryopathy) while bioprosthetic valves deteriorate faster in young women, especially during pregnancy, making this a shared decision.

RCS – Registered Cardiac Sonographer (CCI)

The RCS exam, administered by Cardiovascular Credentialing International (CCI), certifies cardiac sonographers who perform echocardiographic procedures and evaluate cardiovascular anatomy, physiology, and hemodynamics.

170

Questions

180 min

Time Limit

70%

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